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Sunday morning, there will be some epic hangovers in the Hamptons. On Saturday night, Ivan L. Wilzig — better known as Sir Ivan — will hold his annual costume bash at his huge Water Mill, LI, castle complete with its own dungeon.

Sir Ivan, 58, a musician known for his remixes of ’60s free-love songs, has been hosting the parties for more than 15 years. They are notoriously over the top and scandalous, and orgies are widely rumored. Here, he shares some favorite party memories:

• For a 2004 record release party, Sir Ivan wanted to spread a message of peace, so, he says, “I had a dozen little people dressed as Oompa Loompas . . . to show that everyone — tall, short — can get along.”

• In 1997, Sir Ivan’s Jungle Masquerade Ball lured both Donald and Ivana Trump, despite the fact the fact they’d bitterly divorced five years earlier. “They were in the same VIP area on the second floor,” says Ivan, “but they didn’t talk to each other the whole night.”

• In 2012, Sir Ivan managed to make Playboy bunnies look tame by requiring guests to come dressed as “exotic animals” or “bizarre creatures.” “The best one was a girl completely body painted like a tiger,” he says. “She really looked like a tiger, just a very sexy one.”